Mounting for rock drills



March 2, 1937. w. A. MORRISON 2,072,526

y MOUNTING FOR ROCK DRILLS Filed Aug. 23, 1934 mem ,4 2j

Patented Mar. 2, 1937 UNITED STATES PTET FFICE MOUNTING FOR ROCK DRILLS Application August 23, 1934, Serial No. 741,066

4 Claims.

This invention relates to mountings, and more particularly to portable mountings for rock drills and the like.

One object of the invention is to enable that 5 portion of the mounting which supports the rock drill to be conveniently tilted with respect to the face of the rock being drilled.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference characters refer to similar parts,

Figure 1 is an end elevation of a mounting constructed in accordance with the practice of the invention,

Figure 2 is a side elevation of a mounting,

Figure 3 is a transverse View taken through Figure 2 on the line 3--3 looking in the direction indicated by the arrows, and

Figure 4 is a transverse view taken through Figure 3 on the line 4-4 looking in the direction indicated by the arrows.

Referring more particularly to the drawing, the mounting constructed in accordance with the practice of the invention and designated, in general, by 2li, comprises a support 2l shown, for the sake of simplicity of illustration, as consisting `of a pair of skids 22 which are held in spaced relation with respect to each other by cross members 23.

On one end of the support 2| is a rod 24 which is seated in bearings 25 on the skids 22. The rod 24 serves as a pivot for a guide frame 26 having a pair of guide members 2l in the form of channels, of which one leg 28 of each channel serves as a guide for a rock drill 29.

The rock drill may be slidably interlocked with the legs 28 in a well known manner and is suspended from a cable 30 which may be trained over a sheave 3l at the upper extremity of the guide frame and is connected to a hoist 32 on a platform 33 supported by the guide frame 2li. Thus, as the working implement 34, which the rock drill 29 actuates, penetrates the work the hoist 32 may be operated to lower the rock drill 29 and hold it in substantially the correct striking relationship with respect to the working implement. After the working implement has entered the rock to the limit of its extent the hoist may be operated to withdraw it from the drill hole.

i The guide frame 26 may be connected to the rod 24 in any convenient manner, as for instance, by arranging a plate 35 near the lower ends of the members 21 to support bearings 36 through (Cl. Z55-5l) which the rod 24 extends. The guide frame assembly is held intermediate the ends of the rod 2d by collars 3l secured to the rod.

In order to maintain the guide frame 2li in an upright position the mounting is provided with a diagonal brace 38 consisting of a pair of legs 55 of which the lower ends rest on pivots 4D seated in bearings fil on the skids 22. The legs 39 converge in the direction of the guide frame and in the upper ends thereof are pivots l2 seated in a bearing 43. The bearing 43 is disposed slidably on the adjacent legs 44 of the members 2l and has depressions 45 to receive the legs t4. A plate l5 secured to the bearing d3, by bolts lil, engages the inner surfaces of the legs 54 to retain the bearing on the guide frame.

As an additional function the bearing i3 serves as a nut for a feed screw 4B mounted upon the guide frame 25. The bearing is accordingly provided with an enlargement 49 having internal threads 5i! for engagement with the threads of the screw 48.

The screw 48, which extends longitudinally of the guide frame 26 and preferably intermediate the members 2l, is journalled with its upper end 5i in a crosshead 52 secured to the members 2l. A cylindrical extension 53 constituting the lower end of the feed screw is likewise journalled in a crosshead 54 bolted to the members 2l. On the opposite sides of the crosshead 54 are thrust bearings 55 of which one is interposed between the crosshead 55 and the ends of the threads of the screw i3 and the other is interposed between the crosshead and a collar 5t carried by the terminal 53.

In order to enable the screw 48 to be conveniently rotated for raising and lowering the bearing 43 and thereby tilt the guide frame 26 to a desired degree of `angularity the screw is provided with a rod 5l journalled at its lower end in a bearing 58 mounted on the platform 33. On the end of the rod 5l' projecting below the bearing 58 is a crank 59 for rotating the rod and the upper end of the rod is Vconnected to the screw 43 by a suitable universal joint t0.

The operation of the device is as follows: Whenever, owing to irregularities of the surface upon which the mounting rests, such as a rock face, it be desired to adjust the angular relationship of the rock drill and its working implement with respect thereto the feed screw 48 is rotated by means of the crank 59 to raise or lower the bearing 43, depending upon the direction in which it may be required to incline the guide frame 26. After the guide frame has been adjusted to a given position the crank 59 is released and the bearing is held in fixed position by the feed screw 48.

I claim:

l. A mounting for rock drills, comprising a support, a guide frame for a rock drill pivoted to the support, a brace for the guide frame pivoted at one end to the support, a pivot for the other end of the brace, and means on the pivot and the guide frame comprising intermeshing members one of which is rotatable to shift the pivot longitudinally of the guide frame and thereby alter the angular relationship of the guide frame with respect to the support.

2. A mounting for rock drills, comprising a support, a guide frame for a rock drill pivoted to the support, a brace for the guide frame and being pivoted at one end to the support, a pivot for the other end of the brace, and adjustable means on the pivot and the guide frame and comprising a pair of members in threaded engagement with each other and one of which members is adapted to be rotated to shift the pivoii longitudinally of the guide frame and thereby tilt the guide frame with respect to the support.

3. A mounting for rock drills, comprising a support, a guide frame for a rock drill pivoted to the support, a brace for the guide frame pivoted to the support, a pivot for the other end of the brace, a bearing for the pivot and being slidable longitudinally of the guide frame, and means for locking the bearing in position on the guide frame and for actuating the bearing along the guide frame to tilt the guide frame with respect to the support.

4. A mounting for rock drills, comprising a support, a guide frame for a rock drill pivoted to the support, a brace for the guide frame pivoted to the support, a pivot for the other end of the brace, a bearing for the pivot, and a screw on the guide frame threadedly engaging the bearing for actuating the bearing longitudinally of the guide frame and thereby tilt the guide frame with respect to the support.

WILLIAM A. MORRISON. 

